<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>输出数组的长度</title>
    <script>
        var arr = new Array()
        arr[0] = 81
        arr[1] = 82
        arr[2] = 83
        arr[3] = 98
        arr[4] = 59
        for (var i = 0; i < arr.length; i++) {
            console.log('第' + (i + 1) + '位同学分数是：' + arr[i])
        }
        console.log('数组长度为：' + arr.length)
    </script>
</head>

<body>

</body>

</html>